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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 10 — Apr. 1, 1999
  • pp: 1968–1974

Simultaneous measurement of velocity and length of moving surfaces by a speckle velocimeter with two self-mixing laser diodes

Şahin Kaya Özdemir, Tatsuya Takasu, Shigenobu Shinohara, Hirofumi Yoshida, and Masao Sumi  »View Author Affiliations


Applied Optics, Vol. 38, Issue 10, pp. 1968-1974 (1999)
http://dx.doi.org/10.1364/AO.38.001968


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Abstract

A novel laser speckle velocimeter with two self-mixing laser diodes (SM-LD’s) for velocity and length measurements of moving surfaces is reported. The mean frequency of the speckle signal obtained in the measurement system depends on the surface path illuminated by the SM-LD. This behavior of the speckle signal in the SM-LD’s is exploited to detect the front and the end edges of a target surface by sampling continuously the number of intensity changes in a speckle signal waveform. Once the edges are determined, the velocity and the length of the surface are calculated easily. The error for length and velocity measurements of a target with a homogeneous rough plane surface of 60-mm length, moving at a velocity of 200 mm/s, can be as low as 2.1% and 1.75%, respectively.

© 1999 Optical Society of America

OCIS Codes
(030.6140) Coherence and statistical optics : Speckle
(120.7250) Instrumentation, measurement, and metrology : Velocimetry

History
Original Manuscript: September 3, 1998
Revised Manuscript: December 21, 1998
Published: April 1, 1999

Citation
Şahin Kaya Özdemir, Tatsuya Takasu, Shigenobu Shinohara, Hirofumi Yoshida, and Masao Sumi, "Simultaneous measurement of velocity and length of moving surfaces by a speckle velocimeter with two self-mixing laser diodes," Appl. Opt. 38, 1968-1974 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-10-1968

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